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Discussion Starter · #1 ·
I have a 29 gal Biocube reef tank. I often get an oily film on the top of the water. Why doesn't my filter take care of this, and how do I make it go away? Is it harmful to the tank?:arg:
 

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Welcome to TRT !!
I agree with Chris . Point a power head at the surface . It will go away . You need to agitate the surface
 

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Blocking off the lower intake grate will force more water to be skimmed from the surface. It's a simple mod that only requires a small piece of acrylic or other plastic.
 
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